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Z-scheme CdS-Au-BiVO4 with enhanced photocatalytic activity for organic contaminant decomposition

机译：Z-scheme CdS-Au-BiVO4增强光催化活动有机污染物分解

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摘要

A Z-scheme heterogeneous photocatalyst CdS-Au-BiVO4 was synthesized for the first time by photoreduction and deposition-precipitation methods. The microstructures and optical properties of the as-prepared samples were investigated by means of scanning electron microscopy (SEM), field emission scanning electron microscopy (FE-SEM), high resolution transmission electron microscopy (HR-TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV-vis diffuse reflectance spectroscopy (DRS). Due to the oriented accumulation of electrons on the {010} facets of BiVO4 crystals, Au nanoparticles were successfully anchored on the {010} facets of BiVO4 crystals via the photo-reduction process. CdS was further selectively deposited on the surface of Au nanoparticles, benefitting from the strong S-Au interaction. Photocatalytic degradations of tetracycline and Rhodamine B indicated that CdS-Au-BiVO4 exhibits much higher photocatalytic activity than BiVO4, Au-BiVO4, and CdS-BiVO4. Radical trapping experiments confirmed that in the case of CdS-Au-BiVO4, the main reactive species responsible for organic contaminant degradation are h(+), (OH)-O-center dot, and O-center dot(2-), while only h(+) can be produced in the case of CdS-BiVO4. Based on the photoelectrochemical analysis and radical trapping experiments, it can be deduced that the Z-scheme structure of CdS-Au-BiVO4 not only decreases the recombination rate of photo-generated carriers but also makes the holes and electrons keep a higher redox ability.
机译：一个Z-scheme多相光催化剂CdS-Au-BiVO4首次合成了通过光致还原作用和deposition-precipitation方法。和样本的属性通过扫描电子调查显微镜(SEM)、场发射扫描高分辨率电子显微镜(FE-SEM)透射电子显微镜(HR-TEM), x射线衍射(XRD)、x射线光电子能谱(XPS)和紫外可见漫反射反射光谱(DRS)。面向电子积累在{010}BiVO4晶体方面,Au纳米颗粒成功的{010}面固定通过photo-reduction BiVO4晶体的过程。CdS是进一步选择性地沉积Au纳米粒子表面,受益于强S-Au交互。四环素和若丹明B的退化表明CdS-Au-BiVO4展品更高光催化活性比BiVO4 Au-BiVO4,CdS-BiVO4。CdS-Au-BiVO4而言,主要的负责有机活性物种污染物降解h (+), -O-center(哦)点,O-center点(2 -),而只有h (+)对于CdS-BiVO4生产。光电化学分析和激进捕获实验,它可以推断Z-scheme CdS-Au-BiVO4不仅结构减少的重组率photo-generated运营商也使洞和电子保持更高的氧化还原能力。

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